Can I control depth of focus (v depth deph of field)
You can find it under the camera property.
Select the camera and go to the camera tab.
There is a panel named &quot;Depth Of Field&quot;. Either select an object to be your focal point or set the distance.
Set Focal length and radius (f/stops) to adjust the depth.
Here with Radius 0.06

...and here with radius 0.3

From one photographer to another, as you know the Focal length and f/stop produce the DOF effect. Same in Blender where F/stop is better expressed in radius.
You can of course use F/stop instead of radius but don't forget to change the focal length, otherwise you will have to use ridiculously small F/stops. :D